Magnetic Data Cable Connector for Battery-Powered Field Devices
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Solution Overview
Problem
In battery-powered field devices used in process automation systems, the service interface remains active even when not in use, leading to unnecessary power consumption due to the need to keep digital communication interfaces, such as HART modems, energized for occasional servicing.
Innovation Solution
A data cable connector with magnetically activated switches that activate only when a data cable is connected, allowing the field device to power down unused communication interfaces, reducing energy consumption by ensuring they are switched on only when needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the service interface is kept enabled for occasional servicing, then the field device is ready for service connections, but unnecessary power is consumed from the battery
Solution Approach 1:
The service interface is made dynamic by using a magnetically activated switch that changes state based on cable connection. When a data cable is connected, the magnet activates the switch and enables the service interface. When disconnected, the interface automatically disables, creating a dynamic power management system that adapts to operational needs.
Solution Approach 2:
The mechanical action of cable insertion is converted into magnetic activation. The magnet embedded in the data cable part generates a magnetic field that activates the magnetically activated switch on the PCB, replacing direct mechanical contact with magnetic field interaction for interface control.
2Reliability
If the HART modem is kept energized for digital communication, then communication functionality is maintained, but energy store is unnecessarily consumed
Solution Approach 1:
The HART modem operates periodically rather than continuously. It is activated only during periods when a data cable is connected and deactivates during idle periods, creating a periodic operation pattern that maintains communication readiness while minimizing energy consumption during extended idle periods.
Solution Approach 2:
The system automatically manages its own power state based on connection status. The magnetically activated switch automatically enables or disables the HART modem based on the presence or absence of a connected cable, eliminating the need for manual intervention and ensuring optimal power management.
3Use of energy by moving object
If the service interface is switched off to save power, then energy consumption is reduced, but the interface is unavailable when needed
Solution Approach 1:
The system uses feedback from the physical connection state to control power delivery. The magnetically activated switch detects the presence of the data cable through magnetic field interaction and automatically adjusts the power state of the service interface accordingly, ensuring the interface is accessible exactly when needed without manual configuration.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively reduces power consumption by ensuring communication interfaces are only activated when a service tool is connected, optimizing battery life in field devices.
Implementation Method 1
a magnet disposed inside the second housing on an inside surface of the end face... when the second housing is fully inserted into the second recess, the magnet activates the magnetically activated switch
Data Source
AI summary
Disclosed is a data cable connector for a field device of process automation, wherein the data cable connector has a field device part and a data cable part. The field device part includes one or more magnetically activated switches. The data cable part includes a magnet. The field device is configured to determine from the states of the magnetically activated switches whether the data cable part is connected with the field device part, and if so, in what orientation. Based on the states of the magnetically activated switches, the field device may enable and disable communication circuits within the field device including any PHY circuits and modems.